# Configuring Questa Advanced Simulator

Questa Advanced Simulator can be optionally used to validate VHDL entities, and is required for any simulation using a VHDL entity.

By default, the VHDL validation with Questa Advanced Simulator is disabled. In order to active it, you need to go in the Window menu, Perferences and then in the Third Party Softwares tab. You can then enable the validation by clicking on the Use Questa Advanced Simulator to validate VHDL entities checkbox.

Right below that option, you can also set the path to your Questa Advanced Simulator installation directory. In order to do so, simply click the Browse... button and select the corresponding directory. If you activate the validation but do not set the path, you will be prompted to select it the next time a VHDL validation occurs.

Note: You will also be prompted for the path if you try to run a simulation of a circuit that includes a VHDL entity.

Next: VHDL simulator.